Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details)

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Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment $ 64,707 $ 64,634
Accumulated depreciation 42,709 42,293
Property and equipment, net 21,998 22,341
Rental equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 41,996 43,038
Accumulated depreciation 31,475 31,813
Property and equipment, net 10,521 11,225
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 22,711 21,596
Accumulated depreciation 11,234 10,480
Property and equipment, net $ 11,477 $ 11,116